ISO INTERNATIONAL STANDARD

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1 INTERNATIONAL STANDARD ISO First edition Acoustics Sound-scattering properties of surfaces Part 1: Measurement of the random-incidence scattering coefficient in a reverberation room Acoustique Propriétés de dispersion du son par les surfaces Partie 1: Mesurage du coefficient de dispersion sous incidence aléatoire en salle réverbérante Reference number ISO :2004(E) ISO 2004

2 PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel Fax copyright@iso.org Web Published in Switzerland ii ISO 2004 All rights reserved

3 Contents Page Foreword... iv Introduction... v 1 Scope Normative references Terms and definitions Principle Frequency range Test arrangement Reverberation room Turntable and base plate Test sample Test procedure Test signals Source and receiving equipment Measurement of impulse responses Temperature and relative humidity Evaluation of decay curves Expression of results Method of calculation Precision Presentation of results Test report Annex A (informative) Accuracy of the measurement results Bibliography ISO 2004 All rights reserved iii

4 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 2, Building acoustics. ISO consists of the following parts, under the general title Acoustics Sound-scattering properties of surfaces: Part 1: Measurement of the random-incidence scattering coefficient in a reverberation room The following part is under preparation: Part 2: Measurement of the directional diffusion coefficient in a free field iv ISO 2004 All rights reserved

5 Introduction The degree of acoustic scattering from surfaces is very important in all aspects of room acoustics (e.g. in concert halls, sound studios, industrial halls and reverberation chambers). Insufficient scattering may cause strong deviations from exponential sound pressure decay. On the other hand, an approximately diffuse sound field may be obtained with highly scattering surfaces in a room. The degree of scattering in a room can be an important factor related to the acoustic quality of the room. The scattering coefficient is introduced as a new concept in this part of ISO Together with the absorption coefficient, the scattering coefficient will be useful in room acoustic calculations, simulations and prediction models. For some time it has been known that modelling of the scattering from surfaces is very important for obtaining reliable predictions of room acoustics. This part of ISO presents a measurement method to quantify the scattering properties of a surface to replace formerly applied but not generally accepted estimation methods. The work has been coordinated with the working group of the Audio Engineering Society, AES SC for the Characterization of Acoustical Materials. This group emphasized the development of a measurement method for the directional diffusion coefficient, which is different from (but related to) the random incidence scattering coefficient. While the scattering coefficient is a rough measure that describes the degree of scattered sound, the diffusion coefficient describes the directional uniformity of the scattering; i.e. the quality of the diffusing surface. Therefore there is a need for both concepts and they have different applications. ISO 2004 All rights reserved v

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7 INTERNATIONAL STANDARD ISO :2004(E) Acoustics Sound-scattering properties of surfaces Part 1: Measurement of the random-incidence scattering coefficient in a reverberation room 1 Scope This part of ISO specifies a method of measuring the random-incidence scattering coefficient of surfaces as caused by surface roughness. The measurements are made in a reverberation room, either in full scale or on a physical scale model. The measurement results can be used to describe how much the sound reflection from a surface deviates from a specular reflection. The results obtained can be used for comparison purposes and for design calculations with respect to room acoustics and noise control. The method is not intended for characterizing the spatial uniformity of the scattering from a surface. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 354, Acoustics Measurement of sound absorption in a reverberation room ISO , Acoustics Attenuation of sound during propagation outdoors Part 1: Calculation of the absorption of sound by the atmosphere 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 354 and the following apply. 3.1 specular reflection reflection that obeys Snell s law, i.e. the angle of reflection is equal to the angle of incidence NOTE Specular reflection can be obtained approximately from a plane, rigid surface with dimensions much larger than the wavelength of the incident sound. 3.2 diffuse sound field sound field in which the incident sound intensity on a plane surface is equally distributed over all solid angles covering a hemisphere ISO 2004 All rights reserved 1

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